/*
 *	Linux INET6 implementation 
 *
 *	Authors:
 *	Pedro Roque		<roque@di.fc.ul.pt>	
 *
 *	This program is free software; you can redistribute it and/or
 *      modify it under the terms of the GNU General Public License
 *      as published by the Free Software Foundation; either version
 *      2 of the License, or (at your option) any later version.
 */

#ifndef _IP6_FIB_H
#define _IP6_FIB_H

#ifdef __KERNEL__

#include <linux/ipv6_route.h>
#include <linux/rtnetlink.h>
#include <linux/spinlock.h>
#include <net/dst.h>
#include <net/flow.h>
#include <net/netlink.h>

struct rt6_info;

struct fib6_config {
	u32 fc_table;
	u32 fc_metric;
	int fc_dst_len;
	int fc_src_len;
	int fc_ifindex;
	u32 fc_flags;
	u32 fc_protocol;

	struct in6_addr fc_dst;
	struct in6_addr fc_src;
	struct in6_addr fc_gateway;

	unsigned long fc_expires;
	struct nlattr *fc_mx;
	int fc_mx_len;

	struct nl_info fc_nlinfo;
};

struct fib6_node {
	struct fib6_node *parent;
	struct fib6_node *left;
	struct fib6_node *right;
#ifdef CONFIG_IPV6_SUBTREES
	struct fib6_node *subtree;
#endif
	struct rt6_info *leaf;

	__u16 fn_bit;		/* bit key */
	__u16 fn_flags;
	__u32 fn_sernum;
	struct rt6_info *rr_ptr;
};

#ifndef CONFIG_IPV6_SUBTREES
#define FIB6_SUBTREE(fn)	NULL
#else
#define FIB6_SUBTREE(fn)	((fn)->subtree)
#endif

/*
 *	routing information
 *
 */

struct rt6key {
	struct in6_addr addr;
	int plen;
};

struct fib6_table;

struct rt6_info {
	union {
		struct dst_entry dst;
	} u;

	struct inet6_dev *rt6i_idev;

#define rt6i_dev			u.dst.dev
#define rt6i_nexthop			u.dst.neighbour
#define rt6i_expires			u.dst.expires

	struct fib6_node *rt6i_node;

	struct in6_addr rt6i_gateway;

	u32 rt6i_flags;
	u32 rt6i_metric;
	atomic_t rt6i_ref;

	/* more non-fragment space at head required */
	unsigned short rt6i_nfheader_len;

	u8 rt6i_protocol;

	struct fib6_table *rt6i_table;

	struct rt6key rt6i_dst;

#ifdef CONFIG_XFRM
	u32 rt6i_flow_cache_genid;
#endif

	struct rt6key rt6i_src;
};

static inline struct inet6_dev *ip6_dst_idev(struct dst_entry *dst)
{
	return ((struct rt6_info *)dst)->rt6i_idev;
}

struct fib6_walker_t {
	struct fib6_walker_t *prev, *next;
	struct fib6_node *root, *node;
	struct rt6_info *leaf;
	unsigned char state;
	unsigned char prune;
	int (*func) (struct fib6_walker_t *);
	void *args;
};

struct rt6_statistics {
	__u32 fib_nodes;
	__u32 fib_route_nodes;
	__u32 fib_rt_alloc;	/* permanent routes     */
	__u32 fib_rt_entries;	/* rt entries in table  */
	__u32 fib_rt_cache;	/* cache routes         */
	__u32 fib_discarded_routes;
};

#define RTN_TL_ROOT	0x0001
#define RTN_ROOT	0x0002	/* tree root node               */
#define RTN_RTINFO	0x0004	/* node with valid routing info */

/*
 *	priority levels (or metrics)
 *
 */

struct fib6_table {
	struct hlist_node tb6_hlist;
	u32 tb6_id;
	rwlock_t tb6_lock;
	struct fib6_node tb6_root;
};

#define RT6_TABLE_UNSPEC	RT_TABLE_UNSPEC
#define RT6_TABLE_MAIN		RT_TABLE_MAIN
#define RT6_TABLE_DFLT		RT6_TABLE_MAIN
#define RT6_TABLE_INFO		RT6_TABLE_MAIN
#define RT6_TABLE_PREFIX	RT6_TABLE_MAIN

#ifdef CONFIG_IPV6_MULTIPLE_TABLES
#define FIB6_TABLE_MIN		1
#define FIB6_TABLE_MAX		RT_TABLE_MAX
#define RT6_TABLE_LOCAL		RT_TABLE_LOCAL
#else
#define FIB6_TABLE_MIN		RT_TABLE_MAIN
#define FIB6_TABLE_MAX		FIB6_TABLE_MIN
#define RT6_TABLE_LOCAL		RT6_TABLE_MAIN
#endif

typedef struct rt6_info *(*pol_lookup_t) (struct net *,
					  struct fib6_table *,
					  struct flowi *, int);

/*
 *	exported functions
 */

extern struct fib6_table *fib6_get_table(struct net *net, u32 id);
extern struct fib6_table *fib6_new_table(struct net *net, u32 id);
extern struct dst_entry *fib6_rule_lookup(struct net *net,
					  struct flowi *fl, int flags,
					  pol_lookup_t lookup);

extern struct fib6_node *fib6_lookup(struct fib6_node *root,
				     struct in6_addr *daddr,
				     struct in6_addr *saddr);

struct fib6_node *fib6_locate(struct fib6_node *root,
			      struct in6_addr *daddr, int dst_len,
			      struct in6_addr *saddr, int src_len);

extern void fib6_clean_all(struct net *net,
			   int (*func) (struct rt6_info *, void *arg),
			   int prune, void *arg);

extern int fib6_add(struct fib6_node *root,
		    struct rt6_info *rt, struct nl_info *info);

extern int fib6_del(struct rt6_info *rt, struct nl_info *info);

extern void inet6_rt_notify(int event, struct rt6_info *rt,
			    struct nl_info *info);

extern void fib6_run_gc(unsigned long expires, struct net *net);

extern void fib6_gc_cleanup(void);

extern int fib6_init(void);

#ifdef CONFIG_IPV6_MULTIPLE_TABLES
extern int fib6_rules_init(void);
extern void fib6_rules_cleanup(void);
#else
static inline int fib6_rules_init(void)
{
	return 0;
}

static inline void fib6_rules_cleanup(void)
{
	return;
}
#endif
#endif
#endif
